package com.perfma.xtest.tool;

/**
 * @author: junhui.si
 * @date: 2021-01-21 17:35
 **/
public class NullDemo {
    public static void main(String[] args) {
        DDD d = new DDD();
        String s = "123"+d.getD();
        System.out.println(s);
    }

    static class DDD{
        private String d;

        public String getD() {
            return d;
        }
    }
}
